Improvement in harrows and cultivators



iieite. gatteo.

@anni @mire WILLIAM A. ESTES, OAF CHINA, ASSIGNORTO RQM. MANSUR, OF AUGUSTA, MAINE.-

IMPROVEMENT IN HARROWS AND CULTIVATGRS.

The Schedule referred to in these Letters Patent and making part of the same.

To all whom 'it may concern Be it known that I, WILLIAM A. Esrns, of China, in the county of Kennebec, and State of Maine, have invented certain new and useful Improvements in Harrows; and I do hereby declare the following to be a full, clear, and exact description thereof, suflicient to enable those skilled in the art to which my invention appertains, to fully understand and. make and use the same, reference being had to the accompanying sented as composed of' beams B B B and B B' B',-

crossed at right angles, and let into each other at the intersections.

An annular metallic plate is secured on top the beams B B', at their outer ends, anda similar plate, O, is also preferably attached on the under side.

By this construction, a frame is produced which is A much cheaper and more durable than the ordinary frames of rotary harrows, which consist of radial arms set in a hub.

My frame also possesses another advantage over the ordinary kind, which is this: increased space'i'or the application of' teeth, permitting them to be set in irregular lines, or so that they will not follow each other, thus effecting a more general pulverization of the-soil.

The teeth are made tapering, as shown in figs. 2 and 1, .and triangular in' their cross-section, as represented in g. 3.- 'lhe `faces of the teeth are hollowed out, as represented.'4 It is not necessary that Vthese depressions be concavities, as in fig. 3, for other forms,- as angular, will accomplish the same result, which is to sharpen or elongate the corners of the teeth, whereby the clods of ealth are incre readily and perfectly broken.

The teeth maybe for-med, as in fig. 2, with Shanks,

which are fitted into holes of' corresponding form in the frame of the barrow; or they may be made with a ange, as in gs. 3 and 4, having holes, through which bolts lmay be driven into the frame of the harrow.

The draught-attaclnnent consists of a metallic bar, D, turning on a pin in the centre of the hai-row; frame.. The outer portion of this bar is bent down, and the extreme end'is bent back, underneath the frame of the harrowg-f to prevent the bar from rising.

a is an eye, fixed in the outer part of the bar I), for the attachment of the draught-chain. l

The advantages of my barrow, besides breaking the soil to an unusually ne state, are these: it will not clog or hitch against obstructions of any kind, but will revolvearound the same; it doesnot require to be dragged around corners inA turning; the ready mode of applying the teeth, which are to be made of' cast-metal. A

I do not claim as new the construction of the frame and draught-attachment, as above described; neither do I claim broadly the teeth, madetriangular in their cross-section, and with concave sides, in view of the patent to I). M. Cumming, dated November 22, 1859; but havingthns 'described my invention,

What I claim as new, and desire to secure by Letters Patent, is

l. The triangular-pointed teeth, when provided with a shank or perforated plate,'for independent attachment to they barrow-frame, as spcciiied.

2. The harrow herein described, composed of the frame B B C, detachable teeth, lig. 2 or 4, and the draught-bar D, all as setforth.

. In testimony that I claim -the above, I have hereunto subscribed my name, in presence of two witnesses.

IVILLIAM A. ESTES.

Witnesses:

GRANVILLE Manson, E. N. Wirral-is. 

